Asus ZENWATCH3 E-Manual page 16

2. Connect the charging cable to your power adapter, then
connect the power adapter to a nearby power outlet.
NOTE:
• Ensure to use the bundled charging cable and power adapter.
• Rating input current for the wearable device is +5Vdc, 2A, 10W,
see product's label for details.
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ASUS ZenWatch E-Manual